/Engine/Source/Editor/UnrealEd/Public/AssetPrivatizeModel.h
Gets the packages of the assets on disk that would illegally reference the pending private objects if they were made private; won't be accurate until the scanning process completes.
const [TSet](API\Runtime\Core\Containers\TSet)< [FName](API\Runtime\Core\UObject\FName) > & GetIllegalAssetReferences() const